Technology of cross fibre laminates
| · | Principle The technique of cross fibre laminates was developed to enable us to build self supporting helical central cut strings without having to first build a form mould. The shape of the string is given by annular strips cut from flat boards of some common wood such as pine, each strip is glued up with an offset that, calculated from the slope of the stairs, gives the helical form. The sides of this form are veneered with a plywood stiffener and a finishing veneer, and the edges are cut and veneered. |
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| · | Advantages The triangulated structure of the different layers gives the finished string exceptional rigidity and resistance. It’s not necessary to build a form mould and the machining up of the basic elements only requires the use of traditional woodworking machinery. This technique enables us to build quickly strings of any thickness from 60mm to 500mm and more. The strings can even have varying thicknesses, say 500mm at the bottom step and 200mm at the top. There’s no limit to the shape of the string, it can be straight, circular, elliptical or a combination, the manufacturing time is the same. Because the form is built of cheaper wood there’s also a significant saving in materials. |
| · | Technical Limits The basic form must be rigid enough to keep is shape when the outer veneers are applied. To attain this initial rigidity the string must have a minimum thickness of about 60mm. As the inner core is of a common wood it is impossible to build moulded handrails. |
| · | Applications The technology of Cross fibre laminates is well adapted to building curves components that have a rectangular section. This includes staircase strings and handrails, central cut strings of various thicknesses, and generally any piece that is curved in plan. |
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